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US7619580B2 - Antenna feeding network - Google Patents

Antenna feeding network Download PDF

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Publication number
US7619580B2
US7619580B2 US11/578,302 US57830205A US7619580B2 US 7619580 B2 US7619580 B2 US 7619580B2 US 57830205 A US57830205 A US 57830205A US 7619580 B2 US7619580 B2 US 7619580B2
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US
United States
Prior art keywords
antenna feeding
feeding network
dielectric support
tubular compartment
inner conductor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime, expires
Application number
US11/578,302
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English (en)
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US20070205954A1 (en
Inventor
Gregor Lenart
Jens Malmgren
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Cellmax AB
Cellmax Technologies AB
Original Assignee
Cellmax AB
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Filing date
Publication date
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Assigned to CELLMAX TECHNOLOGIES AB reassignment CELLMAX TECHNOLOGIES AB ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LENART, GREGOR, MALMGREN, JENS
Publication of US20070205954A1 publication Critical patent/US20070205954A1/en
Application granted granted Critical
Publication of US7619580B2 publication Critical patent/US7619580B2/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P5/00—Coupling devices of the waveguide type
    • H01P5/12—Coupling devices having more than two ports
    • H01P5/16—Conjugate devices, i.e. devices having at least one port decoupled from one other port
    • H01P5/18—Conjugate devices, i.e. devices having at least one port decoupled from one other port consisting of two coupled guides, e.g. directional couplers
    • H01P5/183—Conjugate devices, i.e. devices having at least one port decoupled from one other port consisting of two coupled guides, e.g. directional couplers at least one of the guides being a coaxial line
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P3/00—Waveguides; Transmission lines of the waveguide type
    • H01P3/02—Waveguides; Transmission lines of the waveguide type with two longitudinal conductors
    • H01P3/06—Coaxial lines
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P3/00—Waveguides; Transmission lines of the waveguide type
    • H01P3/10—Wire waveguides, i.e. with a single solid longitudinal conductor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
    • H01Q19/108—Combination of a dipole with a plane reflecting surface
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/0006—Particular feeding systems

Definitions

  • a typical communications antenna consists of a number of radiating elements, a feeding network and a reflector.
  • the purpose of the feeding network is to distribute a signal from a single connector to all dipoles.
  • the feeding network usually consists of controlled impedance transmission lines.
  • the antenna needs to be impedance matched to a pre-defined value, usually 50 ohm or 75 ohm, otherwise power fed into the antenna will be reflected back to its source instead of being radiated by the dipoles, with poor efficiency as a result.
  • the signal needs to be split between the dipoles in a transmission case, and combined from the dipoles in a reception case, see FIG. 1 .
  • This is usually done using the same network, which is reciprocal. If the splitters/combiners consist of just one junction between 50 lines, impedance match would not be maintained, and the common port would be 25 ohm instead of 50 ohm. Therefore the splitter/combiner usually also provides an impedance transformation circuit that gives 50 ohm impedance at all three ports.
  • cross-overs are usually made using holes between the lines, and impedance matching is done by varying the diameter of the inner conductor. In such a way, the impedance transformation necessary for the splitter/combiner can be realized.
  • the inner conductor is suspended in the square tubes using small pieces of dielectric support means, for example polytetrafluoroethylene (PTFE). These dielectric support means are made as small as possible in order to maintain the line impedance. The necessary impedance transformation is obtained by machining.
  • dielectric support means for example polytetrafluoroethylene (PTFE).
  • Losses in the antenna are mainly due to impedance mismatch or losses in the antenna feeding network.
  • Present invention refers thus to an antenna feeding network, including at least one antenna feeding line, each antenna feeding line comprising a coaxial line having a central inner conductor and a surrounding outer conductor, and is characterised in, that the outer conductor is made of an elongated tubular compartment having an elongated opening along one side of the compartment, and that the inner conductor is suspended within the tubular compartment by means of dielectric support means.
  • FIG. 1 shows a schematic view of the antenna feeding network.
  • FIG. 2 a shows a coaxial line in a cross-section view of prior art.
  • FIG. 2 b shows a coaxial line in a longitudinal cross-section view of prior art.
  • FIG. 3 a shows a coaxial line of present invention with an elongated opening in a cross-section view.
  • FIG. 3 b shows a coaxial line of present invention in a longitudinal cross-section view.
  • FIG. 4 a shows a top view of the connection between two coaxial lines of present invention.
  • FIG. 4 b shows a cross-section view of the connection between two lines of present invention.
  • FIG. 5 a shows a top view of an elongated tubular compartment including the conductive cover of present invention.
  • FIG. 5 b shows a cross-section view of an elongated tubular compartment including the conductive cover of present invention.
  • FIG. 6 shows schematically coaxial lines serving as a reflector for the dipoles.
  • FIGS. 1 and 3 show present invention that refers to an antenna feeding network 1 .
  • FIG. 1 shows a typical antenna where the thicker lines represent transmission lines, also called feeding lines. These feeding lines are usually realized using coaxial lines 2 .
  • Each coaxial line 2 comprises a central inner conductor 3 and a surrounding outer conductor 4 with some kind of dielectric support means 7 in between, see FIG. 3 .
  • the material in the dielectric support means 7 could preferably be a polymer, such as PTFE.
  • the outer conductor 4 is made of an elongated tubular compartment 5 having an elongated opening 6 along one side of the compartment 5 , and the inner conductor 3 is suspended within the tubular compartment 5 by means of dielectric support means 7 , see FIG. 3 and compare with FIG. 2 where there is no elongated opening 6 .
  • FIG. 3 further shows that the dielectric support means 7 and the inner conductor 3 are insertable into the elongated tubular compartment 5 from the ends of the compartments 5
  • having an opening in the outer conductor helps to easily move the dielectric support means 7 and improve the matching of the antenna.
  • the opening 6 is parallel with the electrical currents, there is little impact on the impedance of the coaxial line.
  • machining the inner conductor 3 for changing its impedance dielectric support means 7 in the form of cylindrical pieces, are used and as mentioned preferably made of the polymer material PTFE.
  • These support means 7 serve two purposes. Firstly the support means 7 are used to maintain the inner conductor 3 in the middle of the compartment 5 . Secondly the support means 7 are used to match the transmission lines.
  • the dielectric support means 7 are preferably spacedly positioned along the inner conductor 3 .
  • the dielectric support means 7 are movable on the inner conductor 3 , within the elongated tubular compartment 5 . Further, the dielectric support means 7 are positioned at the desired position on the inner conductor 3 and will be fastened at desired locations therein.
  • FIGS. 4 a - b show the inner conductors 3 of adjacent compartments 5 .
  • the wall between the two compartments is removed along a short distance.
  • a cross-over element 8 is then placed in this opening, and connected to the lines on each side of the wall.
  • the cross-over is designed in such a way, in conjunction with the dimensions of the coaxes and the opening between the two coaxes, that the characteristic impedance is preserved.
  • the cross-over element 8 may be connected to the lines by different methods, for example by means of screws, soldering, gluing or a combination thereof, see FIGS. 4 a - b .
  • the inner conductors 3 are easily accessible from the top. This makes assembly considerably easier.
  • FIGS. 5 a - b show the compartments 5 at the cross-over element 8 that is covered by a conductive cover 9 . Because currents are no longer parallel with the lines 2 near the cross-over, covering the cross-over element 8 with a small-sized metallic surface makes currents travel also in a direction perpendicular to the lines 2 . The rest of the lines 2 do not need a conductive cover 9 .
  • the antenna uses different diameters of the inner conductor 3 to achieve impedance matching.
  • the antenna uses a combination of different inner conductor diameters and dielectric cylinders to achieve impedance matching, see FIG. 5 b.
  • a cover 9 consists of a metallic cover along the whole of the elongated opening 6 of the compartment 5 .
  • a metallic conductive cover 9 covering the cross-over element 8 .
  • the rest of the lines 2 do not need a conductive cover 9 , but can be covered by means of an environmental protection cover made in an inexpensive material such as, but not limited to, plastic.
  • the conductive cover 9 can be electrically connected to the outer conductor 4 , or it can be isolated from the outer conductor 4 using a thin isolation layer.
  • FIG. 6 shows the feeding network 1 , in detail the compartments 5 of the coaxial lines 2 , that is used as a reflector 10 for dipoles 11 in a communication antenna 1 .
  • the compartments of the coaxial lines together with the reflector form a self-supporting framework. Hence it is no longer necessary to have a separate frame.
  • present invention can be used in any configuration of antenna feeding network where the impedance losses and matching can be compensated for by a coaxial line according to the invention.

Landscapes

  • Details Of Aerials (AREA)
  • Waveguide Aerials (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Aerials With Secondary Devices (AREA)
  • Support Of Aerials (AREA)
US11/578,302 2004-04-15 2005-04-15 Antenna feeding network Expired - Lifetime US7619580B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE0400975A SE526987C2 (sv) 2004-04-15 2004-04-15 Matningsnät för antenner
SE0400975-9 2004-04-15
PCT/SE2005/000548 WO2005101566A1 (en) 2004-04-15 2005-04-15 Antenna feeding network

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2005/000548 A-371-Of-International WO2005101566A1 (en) 2004-04-15 2005-04-15 Antenna feeding network

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US12/619,433 Continuation US7830328B2 (en) 2004-04-15 2009-11-16 Antenna feeding network

Publications (2)

Publication Number Publication Date
US20070205954A1 US20070205954A1 (en) 2007-09-06
US7619580B2 true US7619580B2 (en) 2009-11-17

Family

ID=32294316

Family Applications (4)

Application Number Title Priority Date Filing Date
US11/578,302 Expired - Lifetime US7619580B2 (en) 2004-04-15 2005-04-15 Antenna feeding network
US12/619,433 Expired - Lifetime US7830328B2 (en) 2004-04-15 2009-11-16 Antenna feeding network
US12/942,252 Expired - Fee Related US8416143B2 (en) 2004-04-15 2010-11-09 Antenna feeding network
US13/751,445 Expired - Fee Related US9761949B2 (en) 2004-04-15 2013-01-28 Antenna feeding network

Family Applications After (3)

Application Number Title Priority Date Filing Date
US12/619,433 Expired - Lifetime US7830328B2 (en) 2004-04-15 2009-11-16 Antenna feeding network
US12/942,252 Expired - Fee Related US8416143B2 (en) 2004-04-15 2010-11-09 Antenna feeding network
US13/751,445 Expired - Fee Related US9761949B2 (en) 2004-04-15 2013-01-28 Antenna feeding network

Country Status (6)

Country Link
US (4) US7619580B2 (pt)
EP (2) EP2315308A3 (pt)
CN (1) CN100499256C (pt)
BR (1) BRPI0509415A (pt)
SE (1) SE526987C2 (pt)
WO (1) WO2005101566A1 (pt)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130135166A1 (en) * 2004-04-15 2013-05-30 Cellmax Technologies Ab Antenna feeding network
US20190058261A1 (en) * 2015-09-15 2019-02-21 Cellmax Technologies Ab Antenna feeding network comprising at least one holding element
US10511088B2 (en) 2015-10-30 2019-12-17 Huawei Technologies Co., Ltd. Antenna system
US11050161B2 (en) * 2015-09-15 2021-06-29 Cellmax Technologies Ab Antenna feeding network comprising coaxial lines with inner conductors connected by snap-on fingers and a multi-radiator antenna formed therefrom
US11552385B2 (en) 2017-09-19 2023-01-10 Huawei Technologies Co., Ltd. Feed network of base station antenna, base station antenna, and base station

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US20060285330A1 (en) 2005-06-20 2006-12-21 Ingvar Sundell Automatic darkening filter with automatic power management
SE531826C2 (sv) 2007-09-24 2009-08-18 Cellmax Technologies Ab Antennarrangemang
SE531633C2 (sv) 2007-09-24 2009-06-16 Cellmax Technologies Ab Antennarrangemang
US20140191920A1 (en) * 2013-01-10 2014-07-10 Venti Group, LLC Low passive intermodulation chokes for electrical cables
SE536968C2 (sv) 2013-01-31 2014-11-18 Cellmax Technologies Ab Antennarrangemang och basstation
SE536854C2 (sv) * 2013-01-31 2014-10-07 Cellmax Technologies Ab Antennarrangemang och basstation
SE536853C2 (sv) * 2013-01-31 2014-10-07 Cellmax Technologies Ab Antennarrangemang och basstation
WO2015057986A1 (en) 2013-10-18 2015-04-23 Venti Group, LLC Electrical connectors with low passive intermodulation
SE539260C2 (en) 2015-09-15 2017-05-30 Cellmax Tech Ab Antenna arrangement using indirect interconnection
SE539387C2 (en) 2015-09-15 2017-09-12 Cellmax Tech Ab Antenna feeding network
CN106887660A (zh) * 2015-12-16 2017-06-23 北京空间飞行器总体设计部 基于柔性馈电线的射频信号传输结构和方法
SE539769C2 (en) 2016-02-05 2017-11-21 Cellmax Tech Ab Antenna feeding network comprising a coaxial connector
SE540514C2 (en) 2016-02-05 2018-09-25 Cellmax Tech Ab Multi radiator antenna comprising means for indicating antenna main lobe direction
SE1650818A1 (en) * 2016-06-10 2017-12-11 Cellmax Tech Ab Antenna feeding network
DE102018108955A1 (de) * 2018-04-16 2019-10-17 Rosenberger Hochfrequenztechnik Gmbh & Co. Kg Signalleitung
CN113937447B (zh) 2020-07-13 2022-12-27 华为技术有限公司 转接装置、馈电装置和天线
SE544595C2 (en) * 2020-12-14 2022-09-20 Cellmax Tech Ab Reflector for a multi-radiator antenna
SE546582C2 (en) * 2023-04-05 2024-12-10 Cellmax Tech Ab Antenna arrangement
SE546584C2 (en) * 2023-04-05 2024-12-10 Cellmax Tech Ab Antenna element

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130135166A1 (en) * 2004-04-15 2013-05-30 Cellmax Technologies Ab Antenna feeding network
US9761949B2 (en) * 2004-04-15 2017-09-12 Cellmax Technologies Ab Antenna feeding network
US20190058261A1 (en) * 2015-09-15 2019-02-21 Cellmax Technologies Ab Antenna feeding network comprising at least one holding element
US10862221B2 (en) * 2015-09-15 2020-12-08 Cellmax Technologies Ab Antenna feeding network comprising at least one holding element
US11050161B2 (en) * 2015-09-15 2021-06-29 Cellmax Technologies Ab Antenna feeding network comprising coaxial lines with inner conductors connected by snap-on fingers and a multi-radiator antenna formed therefrom
US10511088B2 (en) 2015-10-30 2019-12-17 Huawei Technologies Co., Ltd. Antenna system
US11552385B2 (en) 2017-09-19 2023-01-10 Huawei Technologies Co., Ltd. Feed network of base station antenna, base station antenna, and base station
US12160031B2 (en) 2017-09-19 2024-12-03 Huawei Technologies Co., Ltd. Feed network of base station antenna, base station antenna, and base station

Also Published As

Publication number Publication date
US20070205954A1 (en) 2007-09-06
US8416143B2 (en) 2013-04-09
EP2315308A2 (en) 2011-04-27
US9761949B2 (en) 2017-09-12
WO2005101566A1 (en) 2005-10-27
EP2315308A3 (en) 2012-03-21
SE526987C2 (sv) 2005-11-29
SE0400975L (sv) 2005-10-16
CN100499256C (zh) 2009-06-10
SE0400975D0 (sv) 2004-04-15
US7830328B2 (en) 2010-11-09
BRPI0509415A (pt) 2007-09-04
CN1950973A (zh) 2007-04-18
US20110057856A1 (en) 2011-03-10
US20100141546A1 (en) 2010-06-10
US20130135166A1 (en) 2013-05-30
EP1735871A1 (en) 2006-12-27
EP1735871B1 (en) 2017-05-31

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